Tread portion of an automobile tire



FIG. 1 is a front view of a tread portion of an automobile tire according to the present invention;

FIG. 2 is a perspective view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a fragmentary enlarged view showing the details thereof; and,

FIG. 5 is an end view taken along line 5-5 in FIG. 4.

The evenly spaced broken lines shown in the drawings are for the purpose of illustrating environmental structure and form no part of the claimed design. The dashed-dotted broken lines in the drawings are used to show the boundary between claimed and unclaimed subject matter and form no part of the claimed design. 

The ornamental design for a tread portion of an automobile tire, as shown and described. 